Which MIME types are related to file extension ".opo"?
The .opo file extension is associated with 2 MIME types:
application/octet-stream, application/x-epoc-opo.
A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.
About .opo Files
OPO files are binary modules produced by the OPL compiler.
They serve as compiled output used primarily on Psion devices and systems running the EPOC operating system.
The file’s MIME types are key to understanding its role:
- application/octet-stream: Indicates a general binary file. This type is often used when no specific MIME type fits.
- application/x-epoc-opo: Highlights its purpose as an EPOC OPL object module, geared toward Psion platforms.
Specialized software, like Psion’s OPL development tools or emulators, can open or run these files.
For more details, see FilExt.com.
Based on information from FilExt.com, these files are critical for running and debugging OPL programs on compatible handheld devices.
Relationship between file extension and MIME type
A file extension is a suffix at the end of a filename that indicates what type of file it is. File extensions help both users and operating systems identify what application should be used to open the file.
File extensions are typically separated from the filename by a period (dot) and consist of 2-4 characters, though they can be longer. For example, in the filename "document.pdf", ".pdf" is the file extension.
File extensions are closely related to MIME types, as they both serve to identify the format of a file. However, while MIME types are used primarily by web browsers and servers, file extensions are used by operating systems and applications.
Associated MIME types
application/octet-stream, application/x-epoc-opo
FAQs
What is an .OPO file?
An .opo file is a compiled program written in the Open Programming Language (OPL), primarily used on legacy Psion PDAs running the EPOC operating system. Unlike human-readable source code files (usually .opl), the OPO file contains binary instructions ready to be executed by the device or an emulator.
How do I open an .OPO file on Windows?
You cannot open this file with a standard text editor because it is a binary module. To view or run the program, you must use a Psion emulator, such as EpocEmu or a Psion Series 5 emulator, which simulates the classic EPOC environment on modern PCs.
Can I convert an .OPO file back to source code?
Yes, but you need a specific OPL decompiler to translate the binary .opo file back into a readable .opl text file. If you try to edit the OPO file directly in a program like Notepad, the data will appear as garbled text and the file may become corrupted.
What is the correct MIME type for serving OPO files?
The specific MIME type for these files is application/x-epoc-opo. If a server is not configured for this specific type, it may default to the generic application/octet-stream, which tells the browser to treat the file as a generic binary download.
Why won't this file run on my Android phone?
OPO files contain compiled code specifically for the EPOC architecture used in 1990s handhelds. Modern operating systems like Android or iOS cannot run them natively; you would need to install a specialized OPL runtime environment or a Psion emulator app.
Are .OPO files dangerous?
Generally, no, as they are legacy programs designed for obsolete hardware. However, because they are executable binary files (indicated by the application/octet-stream or application/x-epoc-opo types), you should still exercise standard caution and scan files downloaded from unknown sources.
General FAQ
What is a MIME type?
A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.
MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.
MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.
How do I find the MIME type for a file?
You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.
Why can one extension have multiple MIME types?
Different programs and historical usage may assign various MIME identifiers to the same file format. Listing them together helps maintain compatibility across tools.